The aims of this joint project are to develop and validate the trace analytical methods necessary to perform the migration test as part of the KTW guideline, and to validate their application as part of product testing. At the same time, in order to limit the necessary analytical work to a reasonable level in future, mathematical modelling and calculation of the migration processes shall be promoted.
The publication of the KTW guidelines in 2008 brought about a fundamental change in terms of the evaluation of plastics in contact with drinking water. For instance, before then, the maximum amounts of single substances used for plastic production were limited by means of positive lists. The release of substances into water is tested using migration experiments and determining (plastic-specific) surrogate parameters such as TOC release. According to the new method in the KTW guideline, the substances used for plastics production must still be listed on positive lists, however there is no limit to the maximum application quantity. Instead, a maximum DWPLL (drinking water positive list limit) is given for toxicologically relevant substances and this limit must be adhered to in the migration water. The aims of this joint project are to develop and validate the trace analytical methods necessary to perform the migration test and their application as part of product testing. At the same time, in order to limit the necessary analytical work to a reasonable level in future, mathematical modelling and calculation of the migration processes shall be promoted. To this end, a computer-based mathematical model should be further developed and validated. Due to the diverse partial aspects that require specialist knowledge in a variety of fields (water analysis, mathematical modelling, product testing, approval procedures,...), these objectives could only be achieved within the scope of a joint project with multiple partners.
Publications:
Turkovic, R.; Koch, A.; Kalisch, A.; Klinger, J.: Bewertung von Kunststoffen im Kontakt mit Trinkwasser [Assessment of plastics in contact with drinking water]. DVGW energie|wasser-praxis 11/2015, 62-67 (2015)
